In the present study, Trichoderma harzianum, T. hamatum, T. virens and three isolates of Trichoderma spp. were evaluated for their comparative efficacy against bacterial leaf blight of rice, under field conditions. All the bioagent formulations were significantly effective in reducing disease severity over check during Kharif season 2006 and 2007. T. harzianum was found to be most effective and resulted 48.26 and 59.22 % reduction in disease severity during Kharif season 2006 and 2007, respectively. Maximum increase in grain yield (16.21%) was recorded with T. harzianum followed by isolate 40 (14.58%), during Kharif season 2006. Whereas during Kharif season 2007, maximum increase in grain yield (18.95%) was recorded with T. harzianum which is followed by T. virens (14.65%) and isolate 40 (12.57 %). Present study revealed that T. harzianum (isolated from rice phylloplane) was found to be most effective in reducing disease severity and increasing grain yield as compared to other isolates obtained from different sources.
Bacterial leaf blight of rice, Field efficacy, Trichoderma hamatum, Trichoderma harzianum, Trichoderma virens, Xanthomonas oryzae pv. oryzae
Dube, H.C. (1995). Rhizobacteria in the biological control of plant diseases. In : J., P., Verma, A., Verma, D. Kumar (eds.), Detection of Plant pathogens and their management. Ankor Publishers (Ltd.), New Delhi, 139-152.
Gangwar, G. P. and Sinha, A. P. (2012b). Evaluation of Trichoderma spp. and fluorescent pseudomonads for the management of bacterial leaf blight of rice. Indian Phytopath., 65 (1): 89-91.
Gangwar, G.P. and Sinha, A.P. (2010a). Comparative antagonistic potential of Trichoderma spp. against Xanthomonas oryzae pv. oryzae. Ann. Pl. Protec. Sci., 18(2): 458-463.
Gangwar, G.P. and Sinha, A.P. (2010b). Effect of rate of application of fungal and bacterial antagonists on bacterial leaf blight of rice. Agric. Sci. Digest., 30 (1): 54-56.
Gangwar, G.P. and Sinha, A.P. (2012a). Comparative antagonistic potential of fungal and bacterial bioagents against isolates of Xanthomonas oryzae pv. oryzae. Ann. Pl. Protec. Sci., 20 (1): 154-159.
Kauffman, H.E., Reddy, A.P. K., Heisk, S.P.V. and Maraca, S.D. (1973). An improved technique for evaluating resistance of rice varieties to Xanthomonas oryzae. Plant Dis. Rep., 57: 537â€“541.
Kaul, M.L.H. and Sharma, K.K (1987). Bacterial blight of rice - a review. Biologisches Zentralblatt 106, 141-167.
Manmeet, M. and Thind, B.S. (2002). Management of bacterial blight of rice with bioagents. Plant Dis. Res., 17(1): 21-28.
Mew, T.W. (1987). Current status and future prospects of research on bacterial blight of rice. Annual Review of Phytopathology 25, 359-382.
Mew, T.W., Alvarez, A.M., Leach, J.E. and Swings, J. (1993). Focus on bacterial blight of rice. Plant Dis., 77(1): 5-12.
Nzojiyobiri, J.B., Xu, T., Song, F.M. and Shen, Y. (2003). Resistance induced by Trichoderma harzianum NF9 against Magnaporthe grisea and Xathomonas oryzae pv. oryzae in rice. Chinese Journal of Biological Control, 19(3): 111-114.
Pankhurst, C.E. and Lynch, J.M. (1995). The role of soil microbiology in sustainable intensive agriculture, Advances in Plant Pathology. Vol. II. Academic Press Ltd. pp. 229-247.
Sindhan, G.S., Parasher, R.D. and Hooda, I. (1997). Biological control of bacterial leaf blight of rice caused by Xanthomonas oryzae pv. oryzae. Plant Dis. Res., 12(1): 29-32.
Whipps, J.M. and Mequilken, M.P. (1993). Aspects of biocontrol of fungal pathogens. In: Jones, D.G. (ed.), Exploitation of microorganism. Champman and Hall London. pp. 45-79.
This work is licensed under Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) © Author (s)